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problem with collision response

Started by phaelax Dec 28, 2004 at 6:52 PM 0 replies 400+ views

Original Post

Dec 28, 2004 at 6:52 PM

I can get the intersection point, no problems there. It's the sliding response that doesn't work properly for me. Here's what I've got.


//newPos is the ellipsoid's position when the collision occurs
//normal of sliding plane
Vector slidingNormal = newPos - intersection;
Vector slidingNormalNormalized = slidingNormal.normalized();

//signed distance between original destination point and sliding plane
double distance = -(slidingNormalNormalized * intersection);
distance = vEnd.dot(slidingNormalNormalized) + distance;
//project remaining velocity vector onto sliding plane
Vector finalPos = vEnd - (slidingNormalNormalized*distance);
//get new position of ellipsoid
finalPos = finalPos + slidingNormal;

//translate back from ellipsoid space and return

It basically works on planes that are aligned to the axis', but non-aligned planes I seem to walk through. Like I said, finding the intersection point works fine. Any suggestions?

Zakwayda

Dec 29, 2004 at 7:56 PM

I see what you're doing, but unfortunately I'm too tired to have any hope of finding the errors (if there are any) in your code :(

It may be that you're already using the paper 'Improved Collision Detection and Response' as a reference for this code, but if not, I'd recommend digging up that paper, as it has working code for exactly what you're trying to do.

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